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JOHN NICHOL MURRAY, OF SAULT STE. MARIE, MICHIGAN, ASSIGNOR OF ONE-HALFTO JOSEPH STANLEY BURCHILL, OF SAME PLACE.

COMBINED EXPANDER AND FLUE-CUTTER.

SPECIFICATION forming part of Letters Patent No. 426,044, dated April22, 1890.

Application iiled January 16, 1890. Serial No. 337,041- (No model.)

To all whom t may concern:

Be it known that I, JOHN NIoHoL MURRAY, a citizen of the United States,residing at Sault Ste. Marie, in the county of Chippewa and State ofMichigan, have invented certain new and useful Improvements in aCombined Expander and Flue-Cutter; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the annexed drawings, making a part of this specification,and to the letters of reference marked thereon.

This invention relates to certain new and useful improvements iniiue-expanders; and it has for its object to provide a combined uecutterand expander wherein the parts are interchangeable, so that cutters maybe readily substituted for expander-s in the same device, the otherparts remaining the same and requiring no change. I provide a suitableshell with recesses to receive the cutters and expanders, cutting theflue from the inside by means of a preferably-circular knife, and expandthe flue by screw-pressure. I hold the cutters and knives in theirrecesses or sockets by means of springs, which allow the cutters orknives to move outward as much as necessary to expand or cut, butdrawing them back to place within their recesses or sockets when thepressure is relaxed.

Other objects and advantages of the invention will hereinafter be madeapparent, and the novel features thereof will be specifically pointedout in the appended claim.

The invention is clearly illustrated in the accompanying drawings,which, with the letters of reference marked thereon, form a part of thisspecification, and in which Figure l is a longitudinal section throughmy improved device. Fig. 2 is a cross-section on the line e' z of Fig.l, showing the expanders or rollers in place. Fig. 3 is a like sectionshowing the cutters substituted for the rollers. Fig. 4. is across-section through the shell or stock, showing the recesses orsockets for the rollers and knives, with the different forms of springswhich I sometimes employ to hold the same in place.

Like letters of reference indicate like parts throughout the severalviews.

Referring now to the details of the drawings by letter, A designates theshell or stock, of suitable material and length, provided at its outerend with a plurality of annular grooves a., in which the set-screw h isdesigned to engage to secure in position thereon the rim B, provided atits forward end with a recess b', as shown in Fig. l. These grooves andsetscrew allow of the rotaryT movement of the rim on the stock, butprevent longitudinal movement thereof thereon. By moving the rimlongitudinally on the stock or shell the rollers hereinafter describedcan be adjusted to different depths in the liue. This rim is designed torest against the crown-sheet of the boiler. Near the outer end thisstock or shell is formed with a plurality of recesses or sockets c,extended longitudinally of the shell, and in these recesses or socketsthe rollers or knives are designed to be seated. The opposite end wallsof these recesses are provided with radial grooves d, into which thepintles of the rollers are designed to be placed. These rollers D extendlongitudinally or lengthwise of the stock or shell and have pintles c,which are seated in the radial grooves in the recesses. They areretained in place by springs,which may be of either of the forms shownin Fig. 4, all acting on the same principle and in the same way. In saidFig. 4, F is a substantially U-shaped spring, the bend in which isdesigned to bear against the outer side of the pintle of the roller, theoutwardly-bent arms of the spring bearing against curved walls f in therecesses, as seen at the upper part of Fig. 4. As the rollers are forcedoutward by the screw-pressure hereinafter described, the springs arecompressed and the rollers allowed to vmove outward under the influenceof the pressure; but when the pressure is relaxed the springs force therollers inward to their normal positions.

At the left-hand side of Fig. fi is shown another form of spring, which,instead of being U-shaped, is simply a flat spring, with one end securedin the shell and the other end extended across the groove in the path ofthe pintle of the roller, as shown at the left of said figure. This actsin the same way as the U-shaped spring above described.

IOO

At the right of Fig. 4 there is shown another forln of spring, which issimply a flat spring arranged lengthwise of the stock or shell, with itsend 'i bent downward into the groove of the recess and acting againstthe end'of the pintle of the roller.

G are flat blocks adapted to ft the recesses in the stock and carryingcircular cutters H, as seen best in Fig. 3, the said cutters exs tendedat right angles to the length of the stock or shell, as shown in saidFig. 3. These blocks may be held in their recesses by means of any ofthe forms of springs shown in Fig. 4.

The rollers or knives are forced outward in the following manner: L is atapered screwthreaded rod passed through an opening in the stock orshell and provided with a handwheel or other analogous device k, bywhich it is turned. The threaded portion of this rod engages a nut L atthe inner end of the stock, as shown in Fig. l. By turning upon the rodthe same is forced inward by reason of its engagement with the said nut,and the rollers or cutters, as the case may be, are forced outward andcut or expand the flue.

The rollers may be readily taken .out and replaced by the knives, orvice versa.

What I claim as new is- The combination, with the stock havinglongitudinal apertures provided with radial grooves, of V-shaped springsarranged in the recesses with portions engaging the pintles of rollersand with their ends bearing against curved walls in the recesses, andthe rollers having pintles working in the grooves in the recesses andheld in the bights of the springs, as set forth.

In testimony that I claim the above I have hereunto subscribed my name,in the presence of two witnesses, this 16th day of December, A. D. 1889.

JOHN NICHOL MURRAY.

Witnesses:

C. W. DUNToN, JAY W. SUTTON.

